Pros:
it works
450ronds!! its about 3/4" longer then 300round mags(your probably only gonna notice the diff on a L85)
no feeding problems
strong(drop it on the road and did not put a scratch on it)
ics trade marks on bottom
fast and smooth winding
has nice pinch welds on the seems(adds to look)
probably already put 10,000 rounds through it and held up very nicely, i wish my jg m733 would have done the same
had the mag for about a year now

Cons:
very minor wobble, just about all airsoft mags do so no real cons

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